Adult Health II: Cardiovascular and Respiratory (NUR 440 B)

The correct answer is: Pressures in the left ventricle and atrium are increased.

Explanation:

In left-sided heart failure, the left side of the heart is unable to pump blood efficiently to the rest of the body. As a result, blood backs up into the lungs and causes increased pressure in the left atrium and left ventricle. This increase in pressure is one of the key findings during cardiac catheterization in patients with left-sided heart failure. During cardiac catheterization, pressures are measured in different parts of the heart. In left-sided heart failure, the elevated pressure in the left atrium and left ventricle is due to the impaired ability of the left heart to pump blood effectively. This leads to congestion and fluid retention, particularly in the lungs, causing symptoms like pulmonary edema.

Why the other options are incorrect:

Pressures in the left ventricle and atrium are decreased: This is incorrect. In left-sided heart failure, the pressures in the left ventricle and atrium are increased, not decreased, because of the fluid backing up due to the heart's inability to pump effectively.

Pressures in the right ventricle and atrium are decreased: This is incorrect. While left-sided heart failure can eventually lead to right-sided heart failure (congestive heart failure), in the acute setting of left-sided heart failure, the right side of the heart typically doesn't have decreased pressure. The increased pressure from the left side can affect the right side, causing increased pressures in the right atrium and right ventricle over time.

Pressures in the right ventricle reflect functioning of all heart functioning: This is incorrect. The right ventricle pressures are important but primarily reflect the function of the right side of the heart and the pulmonary circulation. The left ventricle and atrium pressures are more directly impacted in left-sided heart failure.

Summary:

In left-sided heart failure, the nurse should expect to see documentation that pressures in the left ventricle and atrium are increased after cardiac catheterization. This reflects the typical hemodynamic changes caused by the inability of the left side of the heart to pump blood effectively.

Correct Answer:  "Cellular necrosis of myocardial tissue has occurred."

Why This Answer is Correct:

Creatine Kinase-MB (CK-MB) is an enzyme primarily found in cardiac muscle cells. It is released into the bloodstream when myocardial cells are damaged, such as in a myocardial infarction (MI, or heart attack). A marked increase in CK-MB levels 15 hours after admission strongly suggests that heart muscle cells have undergone necrosis, meaning that they have been irreversibly damaged and died. The presence of CK-MB in the blood confirms that myocardial tissue has been compromised. Time Course of CK-MB Elevation in Myocardial Infarction:

Rises: 3 to 6 hours after myocardial injury.

Peaks: Around 12 to 24 hours after the onset of infarction.

Returns to normal: Within 48 to 72 hours.

Since the patient is at the 15-hour mark, CK-MB would still be elevated and potentially peaking, which aligns with the natural progression of myocardial necrosis after a heart attack.

Why the Other Options Are Incorrect:

"Lactic acid is present."

Lactic acid is a marker of anaerobic metabolism, which occurs when tissues do not receive enough oxygen. While lactic acidosis can result from shock, sepsis, or severe hypoxia, it is not a specific marker of myocardial infarction. CK-MB specifically indicates myocardial damage, whereas lactic acid indicates general tissue hypoxia.Elevated lactic acid levels are seen in conditions like sepsis, cardiac arrest, or shock, but not necessarily in myocardial infarction unless severe cardiogenic shock is present.

 "Cardiac function has returned to normal." 

If CK-MB is still markedly elevated, it means ongoing myocardial damage is occurring. Cardiac function does not return to normal while CK-MB levels are high. A return to normal cardiac function would mean CK-MB levels have decreased and symptoms have resolved, which is not the case here.  Elevated CK-MB suggests active myocardial injury, which contradicts the idea that cardiac function has returned to normal.  

 "Thrombolytic therapy is indicated."

Thrombolytic therapy, such as tPA (tissue plasminogen activator), streptokinase, or alteplase, is most effective within the first 12 hours after symptom onset. Since this patient is 15 hours post-admission, the ideal window for thrombolysis has likely passed. After 12 hours, the preferred treatment shifts to percutaneous coronary intervention (PCI), such as angioplasty or stent placement, or other supportive treatments. Thrombolysis is not typically given after 12 hours unless there is ongoing ischemia and no access to PCI.

Summary:

A marked increase in CK-MB 15 hours after admission indicates that myocardial necrosis has occurred, confirming that heart muscle cells have died due to an infarction. This is why the correct answer is:  "Cellular necrosis of myocardial tissue has occurred."

Lactic acid presence is not specific to myocardial infarction.

Cardiac function returning to normal contradicts the elevated CK-MB levels.

Thrombolytic therapy is not the best option after 12 hours post-MI, making PCI the preferred treatment.

The correct answer is:  Connect the client's ET tube to an ambu-bag and assist ventilations via ambu-bag.

Why this is correct:

Immediate Action Required: Equipment failure of the ventilator is a life-threatening emergency because the client is dependent on mechanical ventilation for oxygenation and ventilation. Delaying intervention could lead to hypoxia, respiratory arrest, or death. 

Ambu-Bag (Manual Resuscitator): Connecting the client’s endotracheal (ET) tube to an ambu-bag and manually assisting ventilations is the most appropriate immediate action. This ensures the client continues to receive oxygen and ventilation while the ventilator issue is addressed.

Nurse’s Role: The nurse is trained to use an ambu-bag and should take immediate action to stabilize the client before seeking additional help.

Why the other options are incorrect:

Continue to monitor:

Continuing to monitor is not appropriate in this situation. The client is at immediate risk of hypoxia and respiratory failure due to the ventilator malfunction. Immediate intervention is required.

Page the physician to order a new ventilator:

While the physician may need to be notified, this is not the immediate priority. The nurse must first ensure the client is oxygenated and ventilated using an ambu-bag before addressing the need for a new ventilator.

Ask respiratory therapy to come assess the client:

Respiratory therapy should be notified, but this is not the first action. The nurse must take immediate steps to manually ventilate the client using an ambu-bag to prevent hypoxia and respiratory compromise.

Summary:

The ventilator failure is a critical emergency that requires immediate intervention to prevent hypoxia and respiratory arrest. The most appropriate action is for the nurse to connect the client’s ET tube to an ambu-bag and manually assist ventilations. This ensures the client continues to receive oxygen and ventilation while the issue is resolved. Continuing to monitor, paging the physician, or waiting for respiratory therapy are inappropriate as first actions because they delay life-saving intervention. By taking immediate action, the nurse ensures the client’s safety and prevents further complications. Once the client is stabilized, the nurse can then notify the physician and respiratory therapy to address the ventilator malfunction.

The correct answer is: Client with bulimia.

Rationale:

Metabolic alkalosis occurs when the body loses too much acid or gains too much bicarbonate, leading to an elevated pH level in the blood. Bulimia nervosa can put the body at increased risk for metabolic alkalosis for the following reasons:

Vomiting: Clients with bulimia often induce vomiting as a way to prevent weight gain. Vomiting leads to a loss of stomach acid (hydrochloric acid), which results in an increase in bicarbonate levels in the blood, contributing to metabolic alkalosis.

Dehydration: Vomiting can also cause dehydration, which can further complicate acid-base balance, leading to alkalosis.

Electrolyte Imbalances: Chronic vomiting can lead to imbalances in electrolytes such as potassium, sodium, and chloride, which can exacerbate or contribute to metabolic alkalosis.

Why the other clients are not at increased risk for metabolic alkalosis

Client with COPD (Chronic Obstructive Pulmonary Disease): COPD is more commonly associated with respiratory acidosis, not metabolic alkalosis. This is due to impaired gas exchange, causing CO2 retention and leading to acidosis.

While COPD patients may experience compensatory metabolic alkalosis over time, their primary issue is usually respiratory acidosis due to the retention of carbon dioxide

Client on dialysis: Clients undergoing dialysis are typically at risk for metabolic acidosis due to kidney dysfunction or insufficient removal of acidic waste products during dialysis. They are not usually at high risk for metabolic alkalosis unless there is excessive bicarbonate administration or other specific conditions.

Client with venous stasis ulcer: Venous stasis ulcers are typically associated with chronic venous insufficiency and do not directly lead to metabolic alkalosis. These patients are more likely to experience other issues like fluid retention, but metabolic alkalosis is not a primary concern.

Summary:

The client with bulimia is at an increased risk for metabolic alkalosis due to vomiting, which leads to the loss of stomach acid and the resulting imbalance in pH levels and electrolytes.

Correct Answer:  Maintain oxygenation of 90% or better.

Rationale:

Maintaining adequate oxygenation (typically around 90% or better) is critical in heart failure management. Oxygenation is vital because:

Poor oxygenation can worsen cardiac function by increasing the oxygen demand on the heart and causing further ischemia.

Adequate oxygenation ensures that tissues and organs (especially the heart and brain) receive sufficient oxygen, which is necessary for optimal function and tissue perfusion.

Pulmonary congestion is a common consequence of heart failure, impairing gas exchange in the lungs. Ensuring adequate oxygen levels can help mitigate this and improve overall cardiac output.

Other Options Explained:

Measure and record intake and output:

While monitoring fluid balance is essential for heart failure management, it primarily helps in assessing fluid overload and guiding diuretic therapy. Though it is an important part of care, it does not directly focus on improving oxygenation or cardiac output in an acute setting.

Place the client in the side-lying position:

The side-lying position may be comfortable for some patients, but it is not typically used as a strategy to enhance cardiac output in heart failure. Semi-Fowler’s position is more effective for improving lung expansion and facilitating better breathing, especially in patients with respiratory distress due to heart failure.

Explain all procedures and tests:

While providing information and reducing anxiety is essential in patient care, education alone does not directly support cardiac output. However, this is a supportive measure to ensure the patient understands their care plan, which can improve overall compliance and outcomes in the long run.

Key Takeaway:

Maintaining oxygen saturation at 90% or better is a priority intervention to support adequate cardiac output in a patient with heart failure. This ensures that the heart and other organs receive the oxygen they need, which can help improve overall cardiac function and prevent complications.

The correct answer is: Respiratory infections can cause severe hypoxia and possibly death in these clients.

Explanation:

Clients with asthma, chronic bronchitis, and emphysema (which are types of chronic obstructive pulmonary disease or COPD) are at higher risk of respiratory infections, which can exacerbate their condition and lead to severe complications, including hypoxia (low oxygen levels). Respiratory infections like the flu or pneumonia can significantly worsen their symptoms and lead to hospitalization, respiratory failure, or even death. The Pneumovax (pneumococcal vaccine) and flu vaccines help prevent infections caused by pneumococcus and influenza viruses, which are known to increase the risk of severe respiratory problems in individuals with chronic respiratory diseases. By reducing the incidence of these infections, these vaccines can decrease the risk of exacerbations, improve overall health outcomes, and reduce mortality in these patients.

Why the Other Options Are Incorrect:

All clients are recommended to have these vaccines

While vaccines like Pneumovax and flu vaccines are recommended for many individuals, they are particularly crucial for clients with chronic respiratory diseases because they are more vulnerable to complications from respiratory infections. The reason is not simply because all clients should get these vaccines, but because clients with asthma, chronic bronchitis, and emphysema are at greater risk of severe disease due to compromised lung function.

These vaccines produce bronchodilation and improve oxygenation

While vaccines prevent infections, they do not have a direct effect on bronchodilation (the widening of the air passages in the lungs) or oxygenation (the process of getting oxygen into the bloodstream). Bronchodilators are the medications used to relieve bronchoconstriction (narrowing of the airways) and improve oxygenation, not vaccines.

These vaccines help reduce the tachypnea these clients experience

Tachypnea (rapid breathing) is typically a response to respiratory distress and is managed with other treatments, such as bronchodilators or oxygen therapy. Vaccines do not directly affect the rate of breathing; rather, they help prevent infections that could worsen respiratory distress.

Summary:

Clients with asthma, chronic bronchitis, and emphysema are highly vulnerable to respiratory infections, which can lead to severe complications such as hypoxia and death. Therefore, it is crucial for these patients to receive Pneumovax and flu vaccinations to prevent infections and minimize their risk of exacerbations and serious health issues.

The correct answer is:  maintain the PaO2 at greater than or equal to 60 mm Hg at the lowest O2 concentration possible.

Explanation:

In acute respiratory failure, the goal of oxygen therapy is to maintain adequate oxygenation without causing further complications. Here's why option d is correct and why the others are not: 

PaO2 (Partial Pressure of Oxygen) is a key indicator of oxygenation. In acute respiratory failure, we aim to maintain a PaO2 of 60 mm Hg or greater to ensure sufficient oxygen is delivered to tissues. Using the lowest O2 concentration possible is important because higher levels of oxygen can lead to oxygen toxicity, especially in patients with certain conditions like chronic obstructive pulmonary disease (COPD). The lowest O2 concentration should be used while ensuring the patient has adequate oxygenation to avoid hyperoxia, which can harm the lungs and other tissues.

Why the Other Options are Incorrect:

 always be a low-flow device, such as a nasal cannula or face mask.

This is not always true for acute respiratory failure. While low-flow devices (like a nasal cannula or simple face mask) are appropriate in many cases, high-flow devices or mechanical ventilation may be necessary if the patient is unable to maintain adequate oxygenation with a low-flow device. In cases of severe respiratory failure, higher levels of support may be required.

administer continuous positive airway pressure (CPAP) ventilation to prevent CO2 narcosis.

CPAP is typically used to prevent airway collapse and improve oxygenation, but it is not specifically for preventing CO2 narcosis. In fact, CPAP can worsen CO2 retention in some patients, particularly those with hypoventilation syndromes (e.g., COPD), if it's not used carefully. Management of CO2 narcosis (caused by hypercapnia) requires careful ventilation support to ensure the patient can effectively eliminate CO2.

 correct the PaO2 to a normal level as quickly as possible using mechanical ventilation.

Normalizing PaO2 rapidly with mechanical ventilation can be harmful, as it can lead to oxygen toxicity, particularly when ventilating at high FiO2 (fraction of inspired oxygen). The goal is not necessarily to restore PaO2 to normal levels immediately, but to ensure adequate oxygenation and avoid complications associated with hyperoxia.

Summary:

In acute respiratory failure, the goal is to maintain adequate oxygenation while using the lowest effective oxygen concentration to avoid complications like oxygen toxicity. This approach ensures a PaO2 of ≥60 mm Hg, which is typically sufficient to meet the body's oxygen needs without causing harm. Low-flow devices may be used, but more advanced support like mechanical ventilation may be needed if oxygenation cannot be maintained with simpler methods.

The correct answer is: Chronic obstructive bronchitis

Explanation:

The client's symptoms — a chronic cough producing thick sputum, peripheral edema, and cyanotic nail beds — are highly suggestive of chronic obstructive bronchitis (COB), which is one component of chronic obstructive pulmonary disease (COPD). The client also has a significant smoking history, which is a major risk factor for COPD, including chronic bronchitis and emphysema. In chronic bronchitis, the airways become inflamed, and there is increased mucus production, which leads to a chronic cough with thick sputum. The cyanotic nail beds suggest hypoxia due to poor oxygenation, and peripheral edema often occurs in later stages due to right-sided heart failure (cor pulmonale), which can develop as a complication of chronic lung disease. Chronic obstructive bronchitis is defined by a chronic cough and mucus production for at least 3 months in two consecutive years. The symptoms in this client — thick sputum, chronic cough, cyanosis, and peripheral edema — are all characteristic of chronic bronchitis. Smoking is the most significant risk factor for chronic bronchitis, and this client has a 40-year history of smoking one to two packs a day. Peripheral edema and cyanotic nail beds suggest hypoxia and right-sided heart failure, which can be complications of long-standing COPD, including chronic bronchitis.

Why the Other Options Are Incorrect:

Adult respiratory distress syndrome (ARDS)

ARDS is a severe, sudden onset of respiratory failure, typically following an acute injury or illness (e.g., trauma, pneumonia, sepsis). It is characterized by severe hypoxia, bilateral infiltrates on chest x-ray, and fluid accumulation in the lungs. This client’s symptoms, which are chronic in nature and associated with smoking, do not match the acute onset and pathophysiology of ARDS.

 Asthma

Asthma is a chronic inflammatory disease of the airways that leads to wheezing, shortness of breath, and coughing, particularly at night or early in the morning. However, asthma is usually reversible with treatment (such as bronchodilators or inhaled corticosteroids). This client's chronic cough with thick sputum and cyanosis suggests a more progressive and irreversible lung disease like chronic bronchitis rather than asthma.

Emphysema

Emphysema is another form of COPD characterized by destruction of alveolar walls and loss of lung elasticity, leading to difficulty exhaling and air trapping. While emphysema can cause dyspnea, it does not typically present with a chronic productive cough or thick sputum like chronic bronchitis. Additionally, peripheral edema and cyanosis are more commonly seen in chronic bronchitis due to right-sided heart failure (cor pulmonale), rather than emphysema alone.

Summary:

This client most likely has chronic obstructive bronchitis, a form of COPD characterized by chronic cough, thick sputum production, and cyanosis. The history of smoking is a significant risk factor for this condition. Peripheral edema and cyanotic nail beds suggest complications such as hypoxia and right-sided heart failure. Other conditions like ARDS, asthma, and emphysema are less likely based on the chronic nature of the symptoms and the client's smoking history.

The correct answer is:  ST-segment elevation

Explanation:

In the case of an acute myocardial infarction (MI), the most characteristic electrocardiogram (ECG) change is ST-segment elevation. This is often referred to as STEMI (ST-Elevation Myocardial Infarction), and it indicates that there is significant damage to the heart muscle, typically caused by a blockage in a coronary artery that is preventing blood flow to the heart. The ST-segment elevation is seen when the heart muscle is ischemic and injured, and the electrical activity in the heart changes due to a lack of oxygen.

Why the other options are less likely:

Loss of P waves:

The P wave represents atrial depolarization. Loss or absence of P waves may occur with atrial fibrillation or other arrhythmias but is not a hallmark sign of an acute myocardial infarction.

Bradycardia:

Bradycardia (a slow heart rate) can occur in some patients with MI, but it is not a universal finding. Bradycardia is more likely associated with heart block or other conduction disturbances rather than a direct result of the infarction.

Widening of the QRS complex:

A widening QRS complex can occur in cases of ventricular conduction abnormalities (e.g., bundle branch block) or arrhythmias, but it is not specifically characteristic of an acute MI.

Key Takeaway:

The hallmark of an acute myocardial infarction is ST-segment elevation, which indicates ongoing ischemia and potential damage to the myocardial tissue. This finding is crucial for diagnosing STEMI and determining appropriate treatment, such as thrombolytics or catheter-based interventions.